======================== unified (from filesystem) ========================
                                         'bitrate'  '160.0'
                                        'duration'  '177'
                                          'artist'  'Caterina Valente'
                                     'text_people'  ''
                                         'release'  ''
                                           'title'  'Sing Baby Sing (+ Peter Alexander)'
                                           'quals'  ("['Q-HAP-3', 'Q-UNU-1', 'Q-JZFKS-1', 'Q-LOCALNESS-3', 'Q-HHRNBTT-1', "
 "'Q-OLDST-1', 'q-syn-1', 'q-bass-3', 'q-busy-3', 'q-grit-2', 'q-play-2', "
 "'q-chart-1', 'q-drums-2', 'q-other-3', 'q-piano-1', 'q-vocals-4', "
 "'q-mixbeat-1']")
                                      'lastfmtags'  "['myhitparade', 'jazz', 'female vocalists', 'deutsche schlager', 'schlager']"
                             'musicbrainz_albumid'  ''
                       'musicbrainz_albumartistid'  ''
                            'musicbrainz_artistid'  ''
                             'musicbrainz_trackid'  ''
                                     'tracknumber'  ''
                                      'tracktotal'  ''
                                            'date'  '1956'
                                        'comments'  ''
                                           'genre'  'prerock-german'
                                             'bpm'  '84.000'
                                             'key'  '6A'
                                        'acoustid'  ''
rest: ''

======================== rawer (from filesystem) ========================

'TBPM' (BPM (beats per minute))                     '84.000'
'TCON' (Content type, a.k.a. Genre)                 'prerock-german'
'TDRC' (Recording time)                             '1956'
'TIT2' (Title/songname/content description)         'Sing Baby Sing (+ Peter Alexander)'
'TKEY' (Initial key)                                '6A'
'TPE1' (Lead performer(s)/Soloist(s))               'Caterina Valente'
'TXXX:Q-HAP'                                        '3'
'TXXX:Q-HHRNBTT'                                    '1'
'TXXX:Q-JZFKS'                                      '1'
'TXXX:Q-LOCALNESS'                                  '3'
'TXXX:Q-OLDST'                                      '1'
'TXXX:Q-UNU'                                        '1'
'TXXX:lastfmtags'                                   ['myhitparade', 'jazz', 'female vocalists', 'deutsche schlager', 'schlager']
'TXXX:q-bass'                                       '3'
'TXXX:q-busy'                                       '3'
'TXXX:q-chart'                                      '1'
'TXXX:q-drums'                                      '2'
'TXXX:q-grit'                                       '2'
'TXXX:q-mixbeat'                                    '1'
'TXXX:q-other'                                      '3'
'TXXX:q-piano'                                      '1'
'TXXX:q-play'                                       '2'
'TXXX:q-syn'                                        '1'
'TXXX:q-vocals'                                     '4'
'TXXX:replaygain_track_gain'                        '+1.92 dB'
'TXXX:replaygain_track_peak'                        '0.480820'

========================== row from database ==========================
                                              'id'  1428813
                                            'path'  /data/Music/Bulk/00blues-jazz-exotica-oldies-country/00oldiepop/1956/Caterina Valente - Sing Baby Sing (+ Peter Alexander) 1-1-1956.mp3
                                         'working'  None
                                         'bitrate'  160
                                    'duration_sec'  177
                                           'genre'  prerock-german
                                        'filesize'  3561266
                                           'mtime'  1621627894
                                   'redo_metaread'  0
                                        'rest_str'   00blues jazz exotica oldies country 00oldiepop 1956 1 1 1956 prerock german
                                      'tag_artist'  Caterina Valente
                                     'tag_release'  None
                                       'tag_title'  Sing Baby Sing (+ Peter Alexander)
                                             'bpm'  84.0
                                    'search_title'  'alexander':4,5 'baby':2 'peter':3 'sing':1
                                   'search_artist'  'caterina':1 'valente':2
                                  'search_release'  
                                     'search_rest'  '00oldiepop':5 '1':7 '1956':6 'country':4 'exotica':2 'german':9 'jazz':1 'oldies':3 'prerock':8
                                    'search_combo'  '00oldiepop':12 '1':14 '1956':13 'alexander':4A,5A 'baby':2A 'caterina':6B 'country':11 'exotica':9 'german':16 'jazz':8 'oldies':10 'peter':3A 'prerock':15 'sing':1A 'valente':7B
                                    'tag_tracknum'  None
                                      'num_images'  0
                                             'key'  6A
                                           'quals'  ['Q-HHRNBTT-1', 'q-vocals-4', 'Q-LOCALNESS-3', 'q-piano-1', 'q-mixbeat-1', 'q-play-2', 'Q-OLDST-1', 'Q-UNU-1', 'Q-JZFKS-1', 'q-busy-3', 'q-drums-2', 'q-syn-1', 'q-chart-1', 'q-other-3', 'Q-HAP-3', 'q-bass-3', 'q-grit-2']
                                      'lastfmtags'  ['myhitparade', 'jazz', 'female vocalists', 'deutsche schlager', 'schlager']
                                        'tag_date'  1956
                                     'discogstags'  []

============================== file details ==============================
                                           'mtime'  1621627893.9375324  (2021-05-21 22:11:33)
                             'size'  3561266